An ancient symbol for weaving, and thus for creativity. The dreamer may be going through a rough time in life, and need to find a creative solution to resolve the situation. Dreaming of a spider can be reassuring: You have it in you to find the solution.
If you are an artist of any kind, Spider heralds a rush of creative activity that could point you in a new career direction.
A sign of strength and resiliency. Whatever hard times the dreamer is going through now, she has what it takes to get through them.
To dream of a spider sitting on your skin: you need to be ready to fight provocation and worries.
To dream of a large spider confronting you, signifies that your elevation to fortune will be swift, unless you are in dangerous contact.
Very old dream interpretations say that the spider is an omen of good luck!
All from http://www.experiencefestival.com/dream_dictionary_spider which compiles various sources.